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Example code of t3n/graphql-apollofederation

Informations about the package graphql-apollofederation

t3n.GraphQL.ApolloFederation

Sidecar package for t3n.GraphQL to implement the Apollo Federation specification within your GraphQL schema.

Simply install it via composer:

Note: This package is still under progress and might change in it's implementation

About Apollo Federation

Apollo Federation is an architecture for composing multiple GraphQL services into a single graph. This package provides all functionality to implement the specification to your endpoints so you can use your service with Apollo's tools.

Adjustments

In order to implement the specification you need do add some small adjustments to your existing schema. You can see an example implementation here.

Add Federation Spec schema

  1. Add the graphql specification to your schema:

  2. Add the ServiceQueryTrait to your Query-Resolver

  3. Add a new Entity union to your schema:

You need to make each of your entities part of the _Entity union. In order to do so add a new schema file to your Endpoint that defines the union:

  1. Add the EntitiesQueryTrait to your query resolver

This step is optional if do not have any entities.

The Federation specification needs a new query _entities. Add the trait to all of your QueryResolver:

Also add the _entities to your query type:

  1. Implement EntityResolverInterface

Once the _entities query is called the Entity union will be resolved. The Apollo Gateway server will send queries like

Depending on the representation input a concrete resolver will be instantiated. All of your Resolvers that resolves entities must therefore implement the EntityResolverInterface:

  1. Implement GraphQLTypeAwareInterface if needed

All of your data that you actually resolve and return which is part of the _Entity union type must be aware of it's type name. If it's an object you must implement the GraphQLTypeAwareInterface. If your data is an array there must be a key __typename on the first level.

All versions of graphql-apollofederation with dependencies

PHP Build Version
Package Version
Requires neos/flow Version *
t3n/graphql-tools Version *
php Version >=7.2
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